This 2021 World Air Quality Report presents an overview of the state of global air quality in 2021. The report is based on PM2.5 air quality data from 6,475 cities in 117 countries, regions and territories around the world. The data used to create this report was generated by tens of thousands of regulatory and low-cost air quality monitoring stations operated by governments, non-profit organizations, research institutions, educational facilities, companies, and citizen scientists around the world.
Sixty three of the world's 100 most polluted cities are in India according to the World Air Quality Report 2021, prepared by Swiss Organisation IQAir, released on 22 March 2022.
Delhi in India remains the most polluted city in the world for the 4th conscecutive year followed by Dhaka, Bangladesh.
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